How To Fix a Spongy Brake Pedal Chevy Truck

In truth, this is a video about how to replace and bleed a master cylinder on a C1500, 1990 5.7L to be specific. However, I do have information on how you can solve a spongy brake pedal on one of these trucks by replacing the master cylinder and booster with parts from a later model truck.

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Comments

+ericthecarguy 've done this many times and the best way to me at least is by getting the plastic fitting adapters that fit into the master cyl. ports and then connect a plastic clear hose to both ports and run them into the master cyl reservoir and do exactly what you're doing and you will be able to see when the air is all purged. pump slow so not to aerate the fluid. no mess.

Nice video. What I usually do as a shortcut method is bleed the other end of the short master cylinder lines (where they screw into the proportioning valve). Some people I know would just bleed the master as shown in your video and let the car go, but I just never could bring myself to do that.

I'm not sure about whats going on with your 1990 C1500 but I've been looking into spongy braking problems with my 1997 GMC Sierra C1500 after replacing a rusty brake line that blew on me recently, I did a complete system bleed but seem to have lost my once solid brakes so after doing some research I've noticed people in forums and videos talking about doing a automated bleed (for vehicles with ABS) using certain automotive scan tools to activate the ABS module to burp out any air that may be trapped in the module, evidently even if you do a complete bleed and see no bobbles coming from the bleeders there could still be air trapped in the ABS module.

Tried to do this on an '02 Accord. When putting old reservoir onto new master cylinder it would not seat all way down. Well it would go down then it would raise slightly. No combination of pressure or tightening resevoir screw would keep it down. When installed brake fluid sprayed out of seals were it wasnt seated. Anyone ever have this problem?

Hay Eric I just got a used 03 chevy tracker that doesn't have brakes. I was told there was a bad leak but I haven't found any leaks and when I put vacuum on the rear bleeder there's no fluid and the fluid level doesn't go down but when I bleed the front brakes air/fluid came through and the level went down. Is this just bad lines or something else?